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Marisa Wegrzyn's Psalms of a Questionable Nature, at Walnut Street Theatre, combines a family drama with fears of biological attack.
Psalms tells the story of two estranged stepsisters -- Greta and Moo -- trying to figure out what to do with their deceased parents' house -- and the chemical secrets that fill its basement. The parents were scientists who created an arsenal of known diseases as well as a newly designed virus. "They loved each other very much, and it's this love that happened in the basement lab," says Wegrzyn. "The girls are strangers, but the situation they have to deal with ties them together."